Power scissors



J. T. STONE POWER SCISSORS Sept. 4, 1945.

Filed July 26, 1945 2 Sheets-Sheet l W r M i wm P mm a w m wu nu N NN Sept. 4, 1945. J. T. STONE POWER SCISSORS Filed July 26, 1943 i 2 Sheets-Sheet 2 ZJ'WW J'oH/v Tire/vs.

Patented Sept. 4, 1945 UNITED STATES PATENT OFFICE POWER SCISSORS John T. Stone, Baltimore, Md.

Application July 26, 1943, Serial No. 496,185

2 Claims.

propulsion, but portable and capable of manual operation. A .further object is to have the device suitable for cutting hair on the head of a human being in a convenient and efficient manner, and to be so constructed as to require relatively little mechanism and few parts which may' be easily inspected and repaired.

Other objects will become apparent as the invention is more fully set forth.

The conventional power type of hair cutter used consists of clippers which have their cutter edges close together, short and run at high speed. It has no adjustment to vary the length of the cutters so their jaws will cut on different lengths. It is heavy and somewhat clumsy to handle due to the amount of mechanism required in the device itself close to the point of cutting. In this device, the cutter consists of a single scissors with blades sharp on both edges. The handles for operating the blades are enclosed and arranged so that the movement of a cam mechanism will open and close them. The device is attached' to a flexible shaft operating under power from a distant point.

The main moving parts consist of a single scissors blade projecting from the casing. The adjustment of the length of the cutting action is made through the use of an internal end of a button regulator which restricts the movement of the operating blade in one direction. This adjustment permits the cutting action to be increased or decreased to suit the work to be done. This will vary from time to time.

In the drawings which illustrate an embodiment of this invention:

Figure 1 is a plan view of a power scissors embodying this invention, with the front of the casing partly in section,

Figure 2 is a plan view of the device looking Figure 5 is a sectionaI view taken along lines 5-5 of Figure 4, and

Figure 6 is a sectional view taken along lines 6-6 of Figure 4.

In the drawings I represents a casing of cylindrical form, having a tapered nose 2 at the front and open at 3 to provide a hole of elliptical shape. The rear portion has a cap 4 attached as indi-v cated, with a boss 5 bored for a flexible power cable 6 to pass through into the interior ofthe casing. A clutch mechanism is attached to shaft 8 of the flexible cable 6 and supported suitably within the casing. This clutch comprises a clutch collar 9 slidably mounted on shaft 8 by a key l0 and keyway H and is prevented from slipping oil the end by screw I2. The clutch collar in normal position is separated from the cam clutch l3 which is an integral part of cam H, by a spring IS. The clutch mechanism is operated by a button l6 which projects through the easing I and connects with a lever I'I pivotally anchored to the casing t l8, the end l9 of the lever presses against the end of the clutch collar 9 and forces same into contact with the cam clutch l3 causing the cam [4 to rotate. When Pressure .on the button I5 is released, spring 20 pulls the lever I! back against the stop 2|, and clutch spring I5 forces the jaws of the clutch apart and stops the rotation of the cam M which runs idle on the shaft 8.

A scissors having cutting blades 22 and 23 respectively, the latter being the movable one, is pivoted to the stationary blade by pin 24. The stationary blade is fastened at 25 to the casing I, both blades project through the hole 3 of the nose 2 as indicated. The blades are preferably blunted at their ends. The handle portion 26 attached to the blade 23 is provided with a pin 21 which rides in a slot 28 in the end of lever 29,

'the other end of said lever is formed into a ball 30. The lever is mounted on a bracket 3| which is attached to the casing l, by pin 36. The length of stroke of cutting blades is regulated by sliding the button regulator 32 in slot 33 and allowing the upper end. 34 of button regulator to slidably contact the lower edge 35 of lever 29 and restrict the movement and length of cutting blade 23. The cam I4 contacts the ball surface 30 Of the arm 29 and pushes it down, as it rotates. The coil spring 3'! attached to the wall I of the casing keeps the lower edge 35 of the lever 29 against the upper end 34 of button regulator 32 and serves to return the ball 30 to its normal position when the cam moves out of contact. The movement of the arm 29 operates the blade 23 and permits it to cut material placed in its path between it and the blade 22. The position of the button regulator 32 element does not effect the movement of the cam against the ball 30 attached to the arm 29, as the latter moves in the opposite direction under its action.

The operation of the device seems apparent. The power cable 6, operates the clutch collar and cam when the clutch is engaged. The cam operates the lever 29 and makes a out according to the position of the button regulator 32. The further the button regulator 32 is moved toward the front of the casing the shorter will be their cut. The number of strokes per minute remains the same, no matter what the length of the cut is. The device is handled like a clipper, in the palm of the hand and manipulated around the head of the person or in the case of animals around the body of same. Since the ends of the blades are blunted, they are not liable to cause damage or injury if accidently pressed against a person. The blades being single, are not liable to clogging as in the case of clippers, and they are relatively stronger. They are capable of heavier work than clippers and the variation possible in the length of the cutting action serves many purposes which increase the practical value of the device.

While but one general form of the invention is shown in the drawings and described in the specifications it is not desired to limit this application to this particular form or in any other way otherwise than limited by the scope thereof, as it is appreciated that other forms could be made that would use the same principles and come within the scope of the appended claims.

Having thus described the invention what is claimed is:

1. A cutting shears of the class described comprising in combination, a casing having a tapered front portion positioned on the longitudinal axis thereof with an opening therein, a statonary cutting blade attached to one side of the casing with its cutting portion projecting through the opening parallel to the longitudinal axis of the casing, a movable cutting blade pivoted to the stationary blade so as to operate therewith for cutting purposes, the pivoting point of the blades being within the casing and back of said opening, a handle lever attached integrally to the movable blade and angularly disposed with respect to the said axis so as to operate close to the wall of the casing, a lever pivoted adjacent to the wall of the casing with one end portion slotted for sliding connection with the said handle so as to give same and its movable blade its cutting action, the other end portion of the lever being free and travelling adjacent to the rear of the casing, a cam member mounted on the rear of the casing and adapted to contact the free end of the lever and move same up and down as it rotates, a button regulator slidably mounted in the casing and adapted for contacting and adjustably stopping the movement of the first mentioned end portion of the lever at predetermined points of length, a shaft passing through the rear of the casing for operating the shears with power from an external source, a clutch member mounted on the shaft arranged for driving the cam member when in operating connection therewith, a spring for keeping the clutch and cam member disengaged, another lever pivotally connected to the wall of the casing and with its end portion slanted to engage the clutch and move it into engagement with the cam member, a spring for suspending the last mentioned lever in position and normally out of the position to cause the engagement of the clutch with the cam member, and a button member attached to the last; mentioned lever for manually operating same from outside of the casing so as to control the engagement of the clutch with the cam member and its operative action on the first-mentioned lever and movable blade substantially as described.

2. A cutting shears of the classdescribed comprising in combination, a casing with an opening therein, a stationary cutting blade attached thereto with its cutting portion projecting through the opening, a movable cutting blade pivoted to the stationary blade so as to operate therewith for cutting purposes, an extension attached to the movable blade for operating same, a lever pivoted to the casing with one end portion slotted for sliding connection with the said extension so as to give it and its movable blade its cutting action, the other end portion of the lever being free, a cam member adapted to contact the free end of the lever and move same as it rotates, a regulator mounted in the casing for contacting and adjustably stopping the movement of the first mentioned end portion of the lever at predetermined points of length, a shaft for operating the shears, a clutch member mounted on the shaft arranged for driving the cam member when in connection therewith, another lever connected to the casing to operate the clutch and move it in and out of engagement with the cam member, and means for retaining the clutch and cam members in open and closed positions.

JOHN T. STONE. 

